Experimental investigation of breakage and energy consumption characteristics of mixtures of different components in vertical spindle pulverizer

Xie, Weining, He, Yaqun, Yang, Yong, Shi, Fengnian, Huang, Yong, Li, Hong, Wang, Shuai and Li, Biao (2017) Experimental investigation of breakage and energy consumption characteristics of mixtures of different components in vertical spindle pulverizer. Fuel, 190 208-220. doi:10.1016/j.fuel.2016.11.026


Author Xie, Weining
He, Yaqun
Yang, Yong
Shi, Fengnian
Huang, Yong
Li, Hong
Wang, Shuai
Li, Biao
Title Experimental investigation of breakage and energy consumption characteristics of mixtures of different components in vertical spindle pulverizer
Journal name Fuel   Check publisher's open access policy
ISSN 0016-2361
1873-7153
Publication date 2017-02-15
Year available 2016
Sub-type Article (original research)
DOI 10.1016/j.fuel.2016.11.026
Open Access Status Not yet assessed
Volume 190
Start page 208
End page 220
Total pages 13
Place of publication Oxford, United Kingdom
Publisher Elsevier
Language eng
Subject 1500 Chemical Engineering
2103 Fuel Technology
2102 Energy Engineering and Power Technology
1605 Organic Chemistry
Abstract Complex interactions among components in the heterogeneous grinding have an influence on breakage and energy consumption characteristics of components in mixtures if compared with the single breakage. In this paper, a modified Hardgrove mill, with the addition of a power meter, is used to simulate the grinding process of vertical spindle pulverizer. Binary-component mixtures of coal and pyrite, or coal and calcite, in the size of −2.8 + 2 mm, are prepared to study the heterogeneous breakage. For the mixture A of coal and pyrite, the fineness of pyrite progeny is higher than that from single-breakage. Instead, the coal in mixture A shows the opposite trend. Because of the relatively less difference in hardness between coal and calcite, size distributions of components are environment-independent. Breakage of mixture follows the first-order kinetics, as well as each component in mixtures. In order to describe the energy-size reduction of mixture, a modified model in the form t=A(1-e), has been derived from modeling the mass weighted hardness index of mixture, and its predictions are highly fitted with experimental and supplemental data. In addition, energy split phenomena of components are discussed qualitatively using the modified model. Specific energies that need to yield the same product t of one component both in the single and mixture breakage are compared, and the interaction of one component on the breakage of another one in mixture grinding also has been analyzed. Size distributions of ground products using t are well predicted, which are critical to conduct the computation of size distribution of progenies at given specific energies.
Formatted abstract
Complex interactions among components in the heterogeneous grinding have an influence on breakage and energy consumption characteristics of components in mixtures if compared with the single breakage. In this paper, a modified Hardgrove mill, with the addition of a power meter, is used to simulate the grinding process of vertical spindle pulverizer. Binary-component mixtures of coal and pyrite, or coal and calcite, in the size of −2.8 + 2 mm, are prepared to study the heterogeneous breakage. For the mixture A of coal and pyrite, the fineness of pyrite progeny is higher than that from single-breakage. Instead, the coal in mixture A shows the opposite trend. Because of the relatively less difference in hardness between coal and calcite, size distributions of components are environment-independent. Breakage of mixture follows the first-order kinetics, as well as each component in mixtures. In order to describe the energy-size reduction of mixture, a modified model in the form t10=A(1 – e-b·ECS/Hw), has been derived from modeling the mass weighted hardness index of mixture, and its predictions are highly fitted with experimental and supplemental data. In addition, energy split phenomena of components are discussed qualitatively using the modified model. Specific energies that need to yield the same product t10 of one component both in the single and mixture breakage are compared, and the interaction of one component on the breakage of another one in mixture grinding also has been analyzed. Size distributions of ground products using t10 are well predicted, which are critical to conduct the computation of size distribution of progenies at given specific energies.
Keyword Breakage behavior
Energy split
Heterogeneous grinding
Mass weighted hardness
Specific energy
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status UQ

Document type: Journal Article
Sub-type: Article (original research)
Collections: Julius Kruttschnitt Mineral Research Centre Publications
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